<template>
  
</template>

<script>
export default {

}



function copy(target){
  return  target=[...arr]
}
let arr = [1, 2, 3, 4, 5]
let brr = copy(arr); 
arr.push(100);
console.log(brr); // [1, 2, 3, 4, 5]

</script>

<style>

</style>